class ChangeColumnTransportes < ActiveRecord::Migration
  def self.up
	change_table :transportes do |t|
		t.change :ended_at , :datetime
		t.change :released_at , :datetime
	end
  end

  def self.down
	change_table :transportes do |t|
		t.change :ended_at , :string
		t.change :released_at , :string
	end  
  end
end
